I have a 2012 F-150 SC Lariat w/ ECO, and was wondering if there are any differences in suspension, shocks, etc. as my truck is labeled 4x4 Off Road on the back fender. On the build sheet it says "off road package, $695". I would think all 4x4's have skid plates, just wondering if there are any other differences. I also have to Max Tow package, and aside from the big mirrors, I'm not sure what that entails, besides the receiver hitch and mirrors. Heavy duty alternator, transmission cooler, etc ?